DEVICE AND METHOD FOR TESTING OPTICAL PULSE

Japanese Patent JP3465733

B2

PROBLEM TO BE SOLVED: To improve accuracy in measurement by providing an output/input part with a directional coupler and providing an optical fiber for the length of Tv/2n [(v) is velocity of light and (n) is the refractive index of the optical fiber] between the directional coupler and a connector node.
SOLUTION: An output/input optical fiber 12 longer than Tv/2n is installed between a directional coupler 11 and the connector node. The coupler 11 is composed of an optical fiber or waveguide coupler or an acoustic optical switch, etc. An optical pulse generated at a light source part is guided through the output/input optical fiber 12 to an optical fiber 8 to be measured and a reflected backward scattered light generated at the block of the fiber 12, reflected pulse generated at the node with the fiber 8 and scattered light generated at the block of the fiber 8 are guided to a photodetector 3. At the photodetector 3, the photoelectric converted signal is analyzed by a signal processing part 4 and displayed as an OTDR waveform in the case of an optical pulse testing device having a display part 6. Thus, the conditions at the near terminal part of the optical fiber to be measured and the propriety of connection conditions can be discriminated.

Shinichi Furukawa
Yuji Sera
Kazuo Hokari

JP20955496A

November 10, 2003

August 08, 1996

Click for automatic bibliography generation  

Nippon Telegraph and Telephone Corporation

G01M11/00; G01M11/02; H04B3/46; H04B3/48; H04B10/07; H04B10/071; H04B10/077; H04B10/25; H04B17/00; (IPC1-7): H04B17/00; G01M11/00; G01M11/02; H04B10/08; H04B10/12; H04B10/13; H04B10/135; H04B10/14

JP6201482A
JP5177345A
JP462508A
JP4158237A

Kosaku Sugimura

Previous Patent: CONTROL METHOD FOR BRUSHLESS MOTOR

Next Patent: VOICE SIGNAL DEFORMATION CONNECTION METHOD